There are two main types of exercise. Aerobic and Anaeobic exercise. Let's start with the first one. Aerobic literally means with oxygen. Aerobic exercise has an important distinction; it burns fat as its main fuel. Can anyone find a use for this? Anaerobic means without oxygen.

Anaerobic burns sugar as its main fuel. Despite popular myth, exercise doesn't have to be drastic to provide massive physiological benefits. Even light exercise will burn fat.
Light exercise clears out lactic acid (a waste product in the body) and stimulates cells to regenerate. To ensure you're exercising aerobically (burning fat) rather than exercising anaerobically, it's important to ensure you do several things as you exercise.

The most important is to breathe deep as you exercise. Breathe in deep into your stomach through your nose, hold it and then exhale hard through your mouth.
Secondly, make sure that you exercise at a level that's comfortable. Exercise at a level of 7/10. You should still be able to carry on a conversation while you exercise. Do this for at least 45 minutes a day and notice your energy explode.
Do you think you don't have time to do this? There is always time. Use the time you would have spent sleeping to replenish your body. I guarantee that you'll need less sleep. Use the time in your lunch break to exercise.

The increase in productivity will have you more on the ball, and save you time through the dramatic increase in productivity. See, with the increased oxygen from aerobic exercise your brain speed and efficiency increases. Ride a bike, walk, swim or play sport.
Rebounding (or cellularise as it's now known) is one of the best forms of aerobic exercise around. If you have access to a rebounder, use it. Use any break you have whilst working to engage in some form of movement and deep breathing.
Exercise also strongly benefits the heart. It literally makes it a larger and stronger organ. Deep breathing makes the lungs stronger and larger. Research is now linking exercise to helping benefit and prevent almost every type of disease or ailment.

Movement of any joints promotes blood flow and creates energy. Sitting down all day actually robs the body of energy. If you sit down all day it’s absolutely vital that you promote blood flow, circulation, energy, brain flow and the strength of your heart.